JPH0220541Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a flow rate regulating valve, and is suitable for use in adjusting the flow rate of hot water in a car heater.

Conventionally, in this type of flow regulating valve, molding sand from the engine manufacturing process is often mixed into the hot water (engine cooling water), and when this molding sand sinks into the sealing surface of the packing material, the sealing surface was damaged, resulting in hot water leaking even when the valve was closed and flowing into the car heater's heat exchanger.

In view of the above, an object of the present invention is to provide a flow rate regulating valve that can prevent seal failure even if foreign matter such as molding sand gets stuck in the valve.

In order to achieve the above object, the present invention includes (a) a valve case having an inlet pipe through which fluid flows in and an outlet pipe through which fluid flows out, and (b) a rotating mechanism between the inlet pipe and the outlet pipe of the valve case. (c) a cylindrical valve body that is housed in a cylindrical valve body and has a hole for adjusting the flow rate in a direction intersecting the cylindrical axis direction; (d) This packing material is provided with an arc-shaped sealing surface along the circular outer peripheral surface of the valve body, and (e) This sealing surface has a hole for fluid circulation. (f) an annular main lip for sealing having a cross-sectional shape with a small cross-sectional area on the tip side is formed on the periphery of the hole; Substantially linear auxiliary lips extending substantially parallel to the rotational axis direction of the cylindrical valve body are formed at two locations, upper and lower, respectively; (h) the length of the auxiliary lip is equal to or greater than the diameter of the annular main lip; At the same time, (i) a technical measure is adopted in which the auxiliary lip has a cross-sectional shape that has a smaller cross-sectional area on its tip side;

The present invention will be described below with reference to embodiments shown in the drawings. Figures 1 to 4 show an example in which the present invention is applied to a hot water flow rate regulating valve for a car heater, in which the valve case 1, valve body 2, and cover 8 are all molded from resin. Further, an inlet pipe 1a and an outlet pipe 1b are integrally molded in the valve case 1. The valve case 1 and the cover 8 are integrally joined by a method such as ultrasonic welding. The valve body 2 has an overall cylindrical shape, is rotatably housed between the inlet pipe 1a and the outlet pipe 1b of the valve case 1, and has a circular shape formed at the center of the bottom of the valve body 2. The recess 2a is adapted to fit into the shaft 8a of the cover 8, and the shaft 2b formed at the upper part of the valve body 2 passes through the circular hole 1c of the valve case 1 and projects to the outside. A valve operating lever 9 is fastened to the protruding end of the shaft portion 2b with a screw 10. Furthermore, a sealing O-ring 4 is interposed between the shaft portion 2b and the inner wall of the valve case 1.

A hole 2c for adjusting the flow rate is bored in the valve body 2 in a direction crossing the cylindrical axis direction, and this hole 2c
is formed into a truncated conical shape whose cross-sectional area gradually decreases from the inlet to the outlet.

A rubber packing material 3 is interposed between the outlet pipe side of the valve case 1 and the valve body 2, and this packing material 3 is constantly held on the outer periphery of the valve body 2 by a metal plate spring 5. It is designed to be pressed against the surface. The packing material 3 has a cylindrical portion 3 in its center.
The cylindrical portion 3a passes through a circular hole in the plate spring 5 and is fitted onto the tapered outer peripheral surface of the cylindrical portion 1d of the valve case 1. The packing material 3 has an arc-shaped sealing surface 3b formed along the circular outer circumferential surface of the valve body 2, and this sealing surface 3b
A hole 3c for fluid circulation is provided in the center, and an annular main lip 7 is provided around the periphery of this hole 3c. The upper and lower 2 outside of this annular main lip 7
A substantially linear auxiliary lip 6 extending substantially parallel to the rotational axis direction of the cylindrical valve body 2 is provided at each location. As shown in FIG. 3, this auxiliary lip 6 has a length equal to or greater than the diameter of the annular main lip 7. Further, the lips 6, 7 are integrally molded with the packing material 3, and the cross-sectional shape of both lips 6, 7 is such that the cross-sectional area on the tip side is as shown in FIGS. 1a, b and 4. It has a smaller arc shape. In addition, the cylindrical portion 3a of the packing material 3
An annular projection 3d is provided on the inner periphery of the cylindrical portion 1d to enhance the sealing effect with the cylindrical portion 1d.

To explain the operation in the above configuration, the lever 9
By rotating the valve body 2, the valve body 2 rotates, thereby changing the opening area of the hole 2c of the valve body 2, and adjusting the flow rate of hot water. FIG. 1a shows the rotational position of the valve body 2 in the closed state, and FIG. 1b shows the rotational position of the valve body 2 in the intermediate opening state.
FIG. 2 shows the rotational position of the valve body 2 in the fully open state.

Incidentally, even in the valve closed state shown in FIG. blocked by 7.

On the other hand, FIG. 1b shows an intermediate opening state of the valve body 2, and in this state, hot water flows from the inlet pipe 1a through the hole 2c of the valve body 2 to the outlet pipe 1b as shown by arrow B. There is. In this state, when the valve body 2 is rotated in the direction of arrow C (valve closing direction) shown in FIG.
Some of the foundry sand etc. interposed between the valve body 2
This molding sand, etc., moves upward in the figure as the valve body rotates. however,
In this case, the foundry sand, etc. will be captured by the auxiliary lip 6 on the lower side in the figure. Therefore, since molding sand and the like do not come into contact with the main lip 7, it is possible to prevent the main lip 7 from being damaged by the molding sand and the like. Furthermore, even if foundry sand mixed into the hot water flows near the main lip 5 on the upper side of the diagram, this foundry sand will flow along with the hot water toward the outlet pipe 1b due to the flow of hot water (arrow B). . Therefore, molding sand does not adhere to the front portion of the valve body 2 in the rotating direction of the main lip 7 on the upper side in the figure. Therefore, the main lip 7 on the upper side in the figure is not damaged by biting molding sand or the like.

Furthermore, even when the valve body 2 is rotated in the direction of arrow D (valve opening direction), the foundry sand in the hot water flows in the direction of arrow B, and the foundry sand may not adhere to the vicinity of the main lip 7 on the upper side in the figure. do not have. In addition, the valve body 2 and packing material 3
This is a part of the molding sand etc. that is interposed between the valve body 2 and the sealing surface 3b, and there is a risk that the molding sand etc. will adhere to the surface of the valve body 2 because there is little flow of hot water. Sand is captured by the auxiliary lip 6 on the upper side of the figure in the same way as the auxiliary lip 6 on the lower side of the figure mentioned above, and is prevented from entering the main lip 7.
Therefore, damage to the main lip 7 due to molding sand can be prevented.

Furthermore, even if foundry sand or the like is present near the upper part of the main lip 7 on the lower side of the figure, it will flow in the direction of arrow B due to the flow of hot water. Therefore, in this state, molding sand etc. do not adhere to the upper part of the main lip 7 on the lower side in the figure. Therefore, the main lip 7 is not damaged by biting into foundry sand or the like.

In this way, when the valve body 2 is rotated in either the valve closing direction (direction of arrow C) or the valve opening direction (direction of arrow D) from the intermediate opening state shown in FIG. The auxiliary lips 6, 6 provided on both the upper and lower sides of the main lip 7 trap molding sand, etc., and effectively prevent these from entering the main lip 7.

Therefore, when the valve body 2 is operated to the closed state shown in FIG. can.

5 and 6 show another embodiment, in which an annular groove 3e is formed on the outer periphery of the cylindrical portion 3a of the packing material 3, and a substantially annular spring 11 is fitted into this groove 3e. , the cylindrical portion 3a is reliably pressed against the outer periphery of the cylindrical portion 1d of the case 1 to enhance the sealing effect.

As mentioned above, in the present invention, packing material 3
A hole 3c for fluid circulation is provided in the sealing surface 3b, and an annular main lip 7 for sealing having a cross-sectional shape with a small cross-sectional area on the tip side is formed on the periphery of the hole 3c. Linear auxiliary lips 6, 6 extending in a direction perpendicular to the rotating direction of the cylindrical valve body 2 are formed at two upper and lower locations on the outside of the annular main lip 7, and the lengths of these auxiliary lips 6, 6 are determined by The diameter of the annular main lip 7 is set to be equal to or larger than that of the annular main lip 7, and the auxiliary lip 6,
Since the cross-sectional area of the auxiliary lips 6, 6 is made smaller on the tip side, the contact area between the auxiliary lips 6, 6 and the outer peripheral surface of the valve body 2 can be reduced to increase the contact pressure. has a length equal to or longer than the diameter of the annular main lip 7 on both the upper and lower sides of the annular main lip 7, so that it is possible to reliably prevent foreign matter such as molding sand from passing through the tip contact portion of the auxiliary lips 6, 6. Therefore, it is highly effective in reliably preventing seal failures caused by foreign matter entering the annular main lip 7 portion.

In addition, the auxiliary lips 6, 6 have a cross-sectional shape that has a smaller cross-sectional area on the tip side to reduce the contact area with the outer circumferential surface of the valve body 2, and the auxiliary lips 6,
6 are formed in a straight line extending perpendicularly to the rotational direction of the valve body on both the upper and lower sides of the annular main lip 7, compared to the case where the auxiliary lips 6, 6 are formed in an annular shape.
The contact area between the auxiliary lips 6, 6 and the valve body 2 can be further reduced, and, like the auxiliary lips 6, the main lip 7 is also formed in a cross-sectional shape with a smaller cross-sectional area on the tip side. Since the contact area between the packing material 3 and the valve body 2 is made small, the contact area of the packing material 3 as a whole with the valve body 2 can be made sufficiently small.
Since the sliding resistance can be reduced, the valve operating force can be reduced, which is a great effect.

Furthermore, by making the tip of the annular main lip 7 have a cross-sectional shape that reduces the cross-sectional area on the tip side, the contact area between the main lip 7 and the valve body 2 can be reduced and the surface pressure can be increased. Main lip 7
The effect is that the sealing effect can also be enhanced.

[Brief explanation of the drawing]

Figures 1a, b and 2 are cross-sectional views showing the overall structure of an embodiment of the valve of the present invention, with Figure 1a showing the fully closed state and Figure 1b showing the intermediate opening state. .
FIG. 2 is a sectional view taken in a direction perpendicular to the plane of FIG. 1, and shows the fully opened state. 3 is a front view of the packing material shown in FIGS. 1 and 2 in a single state, FIG. 4 is a sectional view of FIG. 3, and FIG. FIG. 6 is a side view of the spring shown in FIG. 5. 1...Valve case, 1a...Inlet pipe, 1b...
... Outlet pipe, 2 ... Valve body, 2c ... Hole for flow rate adjustment, 3 ... Packing material, 3b ... Seal surface,
3c... Hole for fluid circulation, 6... Auxiliary lip, 7
...Main lip.

Claims (1)

[Claims for Utility Model Registration] (a) A valve case having an inlet pipe through which fluid flows in and an outlet pipe through which fluid flows out; (b) A rotatable structure between the inlet pipe and the outlet pipe of the valve case. (c) a cylindrical valve body that is housed and has a hole for adjusting flow rate in a direction crossing the cylindrical axis; (c) a packing that is interposed between the cylindrical valve body and the valve case to prevent fluid leakage; (d) this packing material is provided with an arc-shaped sealing surface along the circular outer peripheral surface of the valve body; (e) this sealing surface is provided with a hole for fluid circulation; (f) An annular main lip for sealing having a cross-sectional shape with a small cross-sectional area on the tip side is formed on the periphery of the hole; (h) forming substantially straight auxiliary lips extending substantially parallel to the rotational axis direction of the cylindrical valve body at each location, and (h) setting the length of the auxiliary lips to be equal to or greater than the diameter of the annular main lip; (i) A flow rate regulating valve characterized in that the auxiliary lip has a cross-sectional shape that has a smaller cross-sectional area on the tip side.